LOW VOLTAGE DRY-TYPE TRANSFORMERS
ACCORDING TO DIN EN 61558 (VDE 0532/0570)
TECHNICAL INFORMATION
1
Ruhstrat-Transformers with a fixed transformation ratio, as toroidal core or
limb core transformers fulfill the current DIN VDE/ EN regulations.
A high quality standard is guaranteed by the use of high-quality
materials and by the special competence of the employees.
2
TABLE OF CONTENTS
TECHNICAL EXPLANATIONS .............................................................................................................................................................. 4
THREE-PHASE LOW VOLTAGE DRY-TYPE TRANSFORMERS .................................................................................................................. 12
 POWER RANGE 1–30 KVA / TYPE OF PROTECTION IP00 ............................................................................................................... 12
 POWER RANGE 1–30 KVA / TYPE OF PROTECTION IP23 ............................................................................................................... 13
 POWER RANGE 50–500 KVA / TYPE OF PROTECTION IP00 ........................................................................................................... 14
 POWER RANGE 50–500 KVA / TYPE OF PROTECTION IP23 ...........................................................................................................16
THIS IS EISENMANN THERMAL SOLUTIONS/RUHSTRAT .....................................................................................................................18
NOTES ...........................................................................................................................................................................................19
3
TECHNICAL EXPLANATIONS
Ruhstrat-Transformers with a fixed transformation ratio, single-phase and three-phase types, as toroidal core or limb core
transformers fulfill the current DIN VDE/ EN regulations.
General
This catalogue provides a general idea of Ruhstrat´s standard
programme for transformers with fixed transformation ratio,
constructed as toroidal core or limb core transformers.
Applications deviating from the standard programme are our
strong point! Every product can be tailor-made according to your
special application.
Quality Control
During its production every transformer has to undergo an intermediate test and after its production it has to undergo a thorough final electrical test; this is always done according to the
respectively valid process instructions. According to the quality
standard DIN ISO 9001 the documentation of the measuring results is effected in appropriate test certificates.
A high quality standard is guaranteed by the use of high-quality
materials and by the special competence of the employees.
4
Technical Explanations
The transformers are manufactured according to the valid relevant VDE/EN regulations. Low loss grain-oriented electrical
steel is used as the core material. Depending on customer requirements and specifications the transformer windings can
be produced using either copper or aluminum. Both wire and
foil conductors can be wound depending on the current that is
required. Insulation materials are chosen according to the required insulation coordination and the insulation class of the
materials.
Power
Power is calculated as the product of secondary voltage [V] and
secondary current [A], the result is [kVA]. All power specifications refer to the collected power at the secondary side with:
 continuous operation (S1)
 excitation with rated voltage
 rated frequency 50/60 Hz
 an ambient temperature of max. 40 °C
 an altitude of installation up to 1.000 m above MSL
 (load) power factor (LPF) = 1
Overload
In principle, the transformers can be loaded with higher currents for a short period of time, if the average temperature limit
is kept. The limit values for short-time operation (S2) arise from
fig 3.1.
exceeding of the highest admissible overtemperature limit of
the winding.
It has to be ensured that there is a sufficient ventilation resp.
unhindered entry of cool air at the transformer’s site of installation!
ambient temperature [° C] 40
45
50
55
60
insulant class B
1,0
0,96
0,92
0,88
0,82
insulant class F
1,0
0,97
0,94
0,90
0,86
insulant class H
1,0
0,98
0,95
0,92
0,90
fig. 3.1
limit values for overload during short-time operation
table 4.1: factors for the correction of the rated power with ambient tempera-
A: overload in cold state
tures above 40 °C
B: overload in warm state
Warming
The admissible temperature limits stipulated in the respective VDE/EN regulations are not exceeded, if the transformers
are duly operated and if the ambient temperature does not rise
above a maximum of 40 °C.
Altitude of Installation
The rated powers stipulated for the transformers are valid for an
altitude of installation of 1.000 m above main sea level. With an
altitude of installation of more than 1.000 m above main sea level it is the same as with an excessive overtemperature: a power
reduction has to be carried out. This is necessary, as the smaller
atmospheric pressure leads to reduced cooling.
With an ambient temperature above 40 °C the transformer must
not be charged with the full rated current, due to the possible
5
TECHNICAL EXPLANATIONS
altitude of installation [m] up to
1000
1500
2000
2500
3000
insulant class B
1,0
0,98
0,97
0,93
0,92
insulant class F
1,0
0,98
0,97
0,94
0,93
insulant class H
1,0
0,98
0,97
0,94
0,93
table 4.2: factors for the correction of the rated power with operation at high
altitudes
Kind of Load
The standard transformers stipulated refer to pure real load.
Other deviating kinds of load and thyristor power controller operation of the transformers must be considered when they are
constructed.
Insulation
For long life and high operation safety of a transformer it is very
important that no part takes on an inadmissibly high temperature. The insulation of the windings is most sensitive against
warmth, as it can only bear a limited temperature with a normal
duration of life.
The insulation structure allows the use of transformers in dry
rooms. During its production the transformer has to undergo an
impregnation with resin under vacuum and then it is dried in a
6
furnace. Through this the transformers are protected against external influences.
Admissible Winding Temperature
The winding temperature may not exceed the limit temperature
which depends on the insulant class. The limit temperature is
the highest admissible permanent temperature of the winding
at the hottest point. The limit temperature emerges when adding
the ambient temperature (40 °C), the admissible limit overtemperature and a safety addition.
admissible limit
overtemperature
[K]
limit temperature
of the insulant
system [° C]
insulant class B
80
130
insulant class F
100
155
insulant class H
125
180
insulant class
table 5.1:
limit overtemperature and limit temperature of the insulant classes B, F, H
Transformers with Separate Winding
With these transformers there is no electrically conducting connection between the primary and secondary winding, as these
are galvanically separated from each other.
Taps
Transformers can be constructed with taps on the primary as
well as on the secondary side. Taps on the primary side serve
for the adaptation of the transformer to different mains voltage
tolerances.
primary voltage
Transformers with Autowinding
Autotransformers have a winding which consists of two parts.
Both winding parts of the series winding and the parallel winding, are connected in series and are interspersed by the same
magnetic flux. The autotransformer has the same mode of operation as the transformer with separate winding, which is also
called transformer and also allows to step up and down voltages, but no physical separation.
secondary voltage
2 primary voltage
In contrast to the complete transformer, there is only a part of
the output power transferred from the input winding to the output winding with the autotransformer, by means of magnetic
induction. The transfer of the other part of the output power is
effected by means of direct current conduction. Therefore, referring to the autotransformer one distinguishes between transitcircuit power and structural power.
secondary voltage
fig. 5.1:
wiring diagram transformer with separate winding and tap on the primary side
7
TECHNICAL EXPLANATIONS
primary voltage
secondary voltage
fig. 5.2:
wiring diagram transformer with autowinding
The structural power and consequently the size of the transformer diminishes considerably compared to transformers with
separate winding, due to the saving of core iron and winding
copper. The smaller the difference between input voltage and
output voltage, the larger is the structural power.
Degrees of Protection
Depending on the site of installation and the intended purpose
the parts of the transformer which are under voltage have to be
protected against accidental touching and against penetration
of water and foreign bodies. For this reason, different kinds of
8
protection are distinguished. The kinds of protection are indicated by a short sign which consists of two reference numbers
for the degree of protection. The first reference number gives an
information about the protection degree against touching and
penetration of foreign bodies. The second reference number
marks the protection against the penetration of water.
Vector Groups of Three-Phase Transformers
The combination of the different connection systems for highvoltage winding and low-voltage winding is called vector group
of the three-phase transformer. The vector group consists of at
least one capital letter and one small letter as well as of a reference number. If three-phase transformers have a neutral point
(star point) which is lead outside, the vector group is completed
by an “N” or “n”. The capital letter stands for the input winding,
the small one for the output winding. Depending on the connection of the consumer to the winding’s beginning or end of the
low-voltage side phase displacements from 0° resp. 180° and
150° resp. 330° arise between high voltages and low voltages.
This phase displacement is stated by the reference numbers 0,
5, 6 and 11, whereas the phase displacement angle is the product of the reference number and the angle of 30°.
designation /
ref. number
0
5
6
11
0
vector group
vector diagram
wiring picture
secondary /
neutral point
(star point)
Dd0
not available
Yy0
10 % loadable
Dz0
fully loadable
Dy5
fully loadable
Yd5
not available
Yz5
fully loadable
Dd6
not available
Yy6
10 % loadable
Yz5
fully loadable
Dy11
fully loadable
Yd11
not available
Yz11
fully loadable
Ya0
10 % loadable
table 6.1:
vector groups of three-phase transformers
9
TECHNICAL EXPLANATIONS
Low Voltage Dry-Type Transformers according to
DIN EN 61558 (VDE 0532/0570)
1. Structure
Ruhstrat dry-type transformers are manufactured according to
the valid regulations DIN EN 61558 (VDE 0532/0570). Low loss
and cold-rolled sheets for the electrical industry, with privileged
magnetic direction, are used as core material. The windings are
made of insulated copper wire. With high rated currents streamlined copper wire and strip copper wire are used. The other insulations, materials are chosen according to the corresponding
temperature stability class.
 As single-phase or three-phase construction, with separate
winding or autowinding (autotransformer).
 Plants conceived according to customer’s requirements as single and special production with a power range from 0.04 kVA
up to 1.2 MVA and a voltage range up to 10 kV and as high-current transformer up to 10 kA.
 As transformer aggregate in combination with a variable transformer connected in series, in order to regulate voltages in the
output steplessly from 0 to 100 %.
10
2. Advantages
During the production process Ruhstrat Dry-Type transformers
undergo a resin impregnation under vacuum with following furnace drying. This insulation makes a higher protection against
external mechanical influences possible as well as a long service life and high operation safety of the transformers.
3. Winding
If not indicated otherwise, Ruhstrat Dry-Type transformers are
delivered with galvanically separated windings. In case of a
construction with autowinding (autotransformer) the structural
power is reduced. The autotransformer is mechanically smaller
and therefore it can be produced at lower costs.
4. Degrees of Protection
The following standard degrees of protection are possible:
a) Degree of protection IP00 – open design for indoor installation, protection class 1, suitable for fitting up to IP23
b) Degree of protection IP23 – designed with steel sheet enclosure, protection class 1, colour RAL 7032 or according to
customer’s requirements
c) Degree of protection IP54 – designed with steel sheet enclosure, protection class 1, colour RAL 7032 or according to
customer’s requirements
7. Regulations
Ruhstrat Dry-Type transformers are manufactured according to
the current DIN VDE- and EN regulations. Further regulations, as
for example certain marine classifications, can be considered
upon request.
8. Possibilities of application
e. g. test fields, machine controls, marine engineering (precharging transformers for the reduction of the inrush current),
resistance heated industrial furnaces, glass melting plants,
neutral earthing transformers etc.
5. Voltages
Ruhstrat Dry-Type transformers can be offered with voltages up
to 10,000 V.
6. Frequency
Ruhstrat Dry-Type transformers are designed for an operation frequency of 50/60 Hz. Other frequencies like 16 ⅔ Hz and
400 Hz please indicate at request.
11
THREE-PHASE LOW VOLTAGE DRY-TYPE TRANSFORMERS
 POWER RANGE 1–30 KVA / TYPE OF PROTECTION IP00
Technical data
Type:
T-SFD_GAE
Power range:
1 – 30 kVA
Rated voltage (primary):
200 V – 800 V (other voltages on request)
Rated voltage (secondary):
200 V – 800 V (other voltages on request)
Output current at:
- screw-type terminal
- bolt connection
- copper bar
max. 125 A
max. 520 A
from 520 A – 2500 A
Rated frequency:
50/60 Hz
Vector group:
YNyn(x) or Dyn(x), galvanically separated windings
Ambient temperature:
ta = 40 °C
Type of protection:
IP00, open construction, protection class 1 suitable for fitting up to IP23
Accessories:
with positive temperature coefficient sensor for warning and shut-down, led on terminals
Type
Power
[kVA]
Cu content
[kg]
Total weight
[kg]
Dimensions (mm)
B
T
H
T-SFD_GAE 1
1,0
3,0
11
125
210
215
T-SFD_GAE 2,5
2,5
8,5
26
150
240
230
T-SFD_GAE 5
5,0
15,5
42
180
300
320
T-SFD_GAE 6,3
6,3
17,5
52
175
340
345
T-SFD_GAE 8
8,0
18,5
85
195
360
365
T-SFD_GAE 10
10,0
23,0
95
175
425
405
T-SFD_GAE 12,5
12,5
29,0
120
205
425
405
T-SFD_GAE 16
16,0
41,0
150
235
425
405
T-SFD_GAE 20
20,0
52,5
170
220
485
455
T-SFD_GAE 25
25,0
52,5
170
220
485
455
T-SFD_GAE 30
30,0
64,0
205
250
485
455
Deviating voltages, taps, ambient temperatures and degrees of protection, construction as autotransformers, thyristor power controller operation etc. upon request. When odering please indicate your required primary and secondary voltage, required taps as
well as the frequency.
12
THREE-PHASE LOW VOLTAGE DRY-TYPE TRANSFORMERS
 POWER RANGE 1–30 KVA / TYPE OF PROTECTION IP23
Technical data
Type:
T-SFD_GAG
Power range:
1 – 30 kVA
Rated voltage (primary):
200 V – 800 V (other voltages on request)
Rated voltage (secondary):
200 V – 800 V (other voltages on request)
Output current at:
- screw-type terminal
- bolt connection
- copper bar
max. 125 A
max. 520 A
from 520 A – 2500 A
Rated frequency:
50/60 Hz
Vector group:
YNyn(x) or Dyn(x), galvanically separated windings
Ambient temperature:
ta = 40 °C
Type of protection:
IP23, protection class 1
Accessories:
mit Kaltleitertemperaturfühler, zur Wartung und Abschaltung, auf Klemmen geführt
Type
Power
[kVA]
Cu content
[kg]
Total weight
[kg]
Dimensions (mm)
B
T
H
T-SFD_GAG 1
1,0
3,0
14
220
298
220
T-SFD_GAG 2,5
2,5
8,5
30
250
358
300
T-SFD_GAG 5
5,0
15,5
48
350
478
300
T-SFD_GAG 6,3
6,3
17,5
60
350
478
300
T-SFD_GAG 8
8,0
18,5
95
380
558
300
T-SFD_GAG 10
10,0
23,0
107
400
460
480
T-SFD_GAG 12,5
12,5
29,0
130
400
460
480
T-SFD_GAG 16
16,0
41,0
165
400
460
480
T-SFD_GAG 20
20,0
52,5
190
450
520
560
T-SFD_GAG 25
25,0
52,5
190
450
520
560
T-SFD_GAG 30
30,0
64,0
230
450
520
560
Deviating voltages, taps, ambient temperatures and degrees of protection, construction as autotransformers, thyristor power controller operation etc. upon request. When odering please indicate your required primary and secondary voltage, required taps as
well as the frequency.
13
THREE-PHASE LOW VOLTAGE DRY-TYPE TRANSFORMERS
 POWER RANGE 50–500 KVA / TYPE OF PROTECTION IP00
H
B
T
14
Technical data
Type:
T-SFD_GAE
Power range:
50 – 500 kVA
Rated voltage (primary):
200 V – 800 V (other voltages on request)
Rated voltage (secondary):
200 V – 800 V (other voltages on request)
Output current at:
- screw-type terminal
- bolt connection
- copper bar
max. 125 A
max. 520 A
from 520 A – 2500 A
Rated frequency:
50/60 Hz
Vector group:
YNyn(x) oder Dyn(x), galvanically separated windings
Ambient temperature:
ta = 40 °C
Type of protection:
IP00, open construction, protection class 1 suitable for fitting up to IP23
Accessories:
with positive temperature coefficient sensor for warning and shut-down, led on terminals
Type
Power
[kVA]
Cu content
[kg]
Total weight
[kg]
Dimensions (mm)
B
T
H
T-SFD_GAE 50
50
61
300
750
232
620
T-SFD_GAE 63
63
87
310
800
252
620
T-SFD_GAE 80
80
82
370
800
242
710
T-SFD_GAE 100
100
104
450
800
262
760
T-SFD_GAE 125
125
121
530
900
282
760
T-SFD_GAE 160
160
156
630
900
262
850
T-SFD_GAE 200
200
196
760
1100
295
1010
T-SFD_GAE 250
250
224
890
1100
306
1050
T-SFD_GAE 315
315
284
1070
1100
314
1100
T-SFD_GAE 400
400
316
1370
1240
334
1190
T-SFD_GAE 500
500
420
1620
1300
343
1210
Deviating voltages, taps, ambient temperatures and degrees of protection, construction as autotransformers, thyristor power controller operation etc. upon request. When odering please indicate your required primary and secondary voltage, required taps as
well as the frequency.
15
THREE-PHASE LOW VOLTAGE DRY-TYPE TRANSFORMERS
 POWER RANGE 50–500 KVA / TYPE OF PROTECTION IP23
T
B
H
16
Technical data
Type:
T-SFD_GAG
Power range:
50 – 500 kVA
Rated voltage (primary):
200 V – 800 V (other voltages on request)
Rated voltage (secondary):
200 V – 800 V (other voltages on request)
Output current at:
- screw-type terminal
- bolt connection
- copper bar
max. 125 A
max. 520 A
from 520 A – 2500 A
Rated frequency:
50/60 Hz
Vector group:
YNyn(x) oder Dyn(x), galvanically separated windings
Ambient temperature:
ta = 40 °C
Type of protection:
IP23, protection class 1
Accessories:
with positive temperature coefficient sensor for warning and shut-down, led on terminals
Type
Power
[kVA]
Cu content
[kg]
Total weight
[kg]
Dimensions (mm)
B
T
H
T-SFD_GAG 50
50
61
360
1090
690
1124
T-SFD_GAG 63
63
87
390
1090
690
1124
T-SFD_GAG 80
80
82
450
1090
690
1124
T-SFD_GAG 100
100
104
530
1090
690
1124
T-SFD_GAG 125
125
121
630
1290
790
1225
T-SFD_GAG 160
160
156
730
1290
790
1225
T-SFD_GAG 200
200
196
910
1540
1050
1470
T-SFD_GAG 250
250
224
1040
1540
1050
1470
T-SFD_GAG 315
315
284
1220
1540
1050
1470
T-SFD_GAG 400
400
316
1620
1780
1090
1680
T-SFD_GAG 500
500
420
1870
1780
1090
1680
Deviating voltages, taps, ambient temperatures and degrees of protection, construction as autotransformers, thyristor power controller operation etc. upon request. When odering please indicate your required primary and secondary voltage, required taps as
well as the frequency.
17
THIS IS EISENMANN THERMAL SOLUTIONS/RUHSTRAT
Eisenmann Thermal
Solutions is a leading
company in the market of electronics and
plant construction.
Our products operate
world-wide in industrial and research facilities.
Ruhstrat in Bovenden
In 2015, Ruhstrat
GmbH & Co. KG, located in Bovenden/Germany, became Eisenmann Thermal Solutions GmbH & Co. KG, a subsidiary of Eisenmann SE.
The brand name “Ruhstrat” is still used for the development and
production of electrical testing technology, voltage optimizers,
transformers and resistors for Eisenmann Thermal Solutions Machine and Services’.
Ruhstrat has over 80 years of experience in voltage technology
and offers modern equipment for protection against voltage dips
and for voltage stabilization.
Ruhstrat is an expert in voltage optimizing systems as well as for
low and middle voltage transformers. Producing our own transformers with control cabinets guarantees a high and stable quality level in all electrical components.
You wish for more information regarding Ruhstrat and our products? Just visit our website:
www.ruhstrat.com
You have questions regarding Low Voltage Dry-Type Transformers and/or you require an offer? Under the link
http://tinyurl.com/dry-type you will find various means to contact us.
It goes even quicker by scanning our QR-code (shown on the left side) using your smartphone or tablet.
Our sales team will be most pleased to consult you regarding all questions to our products.
Electrical Test Solutions
18
Voltage Optimization
Transformers
AC/DC Reactors
NOTES
19
Eisenmann Thermal Solutions GmbH & Co. KG
Leinetal / Auf der Mauer 1, 37120 Bovenden, Germany
Phone: +49 5 51 820 830 – 0, Fax: +49 5 51 820 830 – 50, E-Mail: info@ruhstrat.com
www.ruhstrat.com
2016 © Eisenmann Thermal Solutions GmbH & Co. KG I 04-2016 | 01
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